WinError 10054

[Fermín Rodríguez Hernández]

Dear all,

I am a bit new to pyomo, although some previous experience with LP and MILP. I am setting up a MILP using pyomo and getting the following error:

 [WinError 10054] An existing connection was forcibly closed by the remote host

while I am pretty sure I am running my code locally. Do you have any clue about the origin of this error?

Thank you very much in advance!
Best regards,

Fermin

[Siirola, John]

Fermin,

 

Unfortunately, there’s not much that can be done to diagnose your problem with the information you have given.  Can you provide more information, including:

• The full stack trace / console log
• Information on your environment, including:
• Platform (we assume Windows?)
• Python distribution and version
• How you installed Pyomo (pip, conda, source)
• What solver / solver interface are you using
• How are you running Pyomo (at the command line? Through an IDE – and if so which one?)
• (Ideally) the script you are running (model, driver, etc).

 

Best regards,

John

 

From: pyomo...@googlegroups.com <pyomo...@googlegroups.com> On Behalf Of Fermín Rodríguez Hernández
Sent: Tuesday, January 13, 2026 4:17 AM
To: Pyomo Forum <pyomo...@googlegroups.com>
Subject: [EXTERNAL] WinError 10054

 

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[Fermín Rodríguez Hernández]

Hi John, thanks for your answer, here are my specifications:

• The full stack trace / console log

>> the error is quite wire to me, it just stop, writting that message, without any traceback error, even the debug console is completely close, so I have to start again

• Information on your environment, including:

• • Platform (we assume Windows?) -> win 11
  • Python distribution and version -> 3.12.10 (local venv)
  • How you installed Pyomo (pip, conda, source) -> pip
  • libraries: Package                       Version
    ----------------------------- -----------
    annotated-types               0.7.0
    arrow                         1.4.0
    boto3                         1.42.25
    botocore                      1.42.25
    databricks-connect            16.1.4
    databricks-sdk                0.77.0
    databricks-sql-connector      3.7.4
    debugpy                       1.8.19
  • highspy                       1.11.0
    ipykernel                     7.1.0
    ipython                       9.9.0
    ipython_pygments_lexers       1.1.1
    jupyter_client                8.8.0
    jupyter_core                  5.9.1
    jupyter-events                0.12.0
    jupyter-lsp                   2.3.0
    jupyter_server                2.17.0
    jupyter_server_terminals      0.5.3
    jupyterlab                    4.2.3
    jupyterlab_pygments           0.3.0
    jupyterlab_server             2.28.0
    loguru                        0.7.3
    matplotlib                    3.8.3
    matplotlib-inline             0.2.1
    nbconvert                     7.16.6
    nbformat                      5.10.4
    numpy                         1.26.4
    pandas                        1.5.3
    pandera                       0.22.1
    pillow                        10.4.0
    pip                           25.3
    pyarrow                       16.1.0
    pydantic                      2.12.2
    pydantic_core                 2.41.4
    pyomo                         6.9.4
    scipy                         1.17.0
    seaborn                       0.13.2
    SQLAlchemy                    2.0.44
    

• What solver / solver interface are you using

from pyomo.environ import SolverFactory

optimizer = SolverFactory("appsi_highs")

solver_KPI = optimizer.solve(
            model,
            tee=True,
        )

• How are you running Pyomo (at the command line? Through an IDE – and if so which one?)  -> I use VSC
• (Ideally) the script you are running (model, driver, etc). -> this I can not provide, sorry, but appreciate very much any hint you could suggest

Thank you very much in advance!

[Siirola, John]

OK.  This looks like something fighting with your VScode environment.  Some suggestions (in order):

• Update Pyomo to 6.9.5 (just as a matter of course – I don’t think there were any changes in that release that would directly affect this issue, but it never hurts)
• Try running with SolverFactory("highs") – i.e., a wrapper around the current development interface from pyomo.contrib.solver and not the beta interface from APPSI.
• Try running with tee=False
• Try running your python script from a native command line and not through VScode

 

Unfortunately, I don’t generally develop in VScode (and without knowing your full environment / model, it is unlikely that we will be able to reproduce your error – so I am just guessing).

 

Best,

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